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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37146010465a9c7ee110ed0fb0725d74883eeb02a304d04b478c8bb3250ea548' 
  AND token = 'vI+5+mcxQr6PBdk1NACVnimY0AmwOzRoXqpo0L1uQsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}